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INTRODUCTION

  This section contains a large number of date and time functions which
  can help perform a large variety of calculations.  In the past it was
  necessary to develop user-defined functions to perform certain financial
  calculations.  Clipper Tools One provides a means that not only eliminates
  the need to write user-defined functions, but also one that is extremely
  quick, since it is written entirely in Assembler.

  Please note that Clipper already performs a validity test on the date.
  Since the date test in Clipper cannot be suspended, it is not possible
  to use a separate user-defined function to deal with the error of an
  unacceptable date.  Clipper will always replace an invalid date with a
  zero date.  These internal tests are executed via keyboard input and by
  call with CTOD().  For this reason, no examples with an invalid date
  have been included.  However, the results produced by a function for a
  zero date have been described for each example.